Board of Directors

Dr. Stephen Dilly, President, Chief Executive Officer, and Board Chair of SonomaBio, brings nearly forty years of executive management experience in the biopharmaceutical industry. Most recently, he served as President and CEO of Codexis (Nasdaq: CDXS) where he continues to serve as Chair of the Board of Directors. At Codexis, Stephen led the transformation of the company from a life science tools provider into a full-service CDMO pioneering enzymatic oligonucleotide synthesis. Prior to Codexis, he served as President and CEO of Sierra Oncology (Nasdaq: SRRA) through its recent sale to GlaxoSmithKline for $1.9 billion. Dr. Dilly also served as CEO of Aimmune Therapeutics, acquired by Nestle Health Science for $2.6 billion. Additionally, Dr. Dilly has served in executive roles at Genentech, Chiron and SmithKline Beecham and has been associated with the development, approval and launch of more than twenty-five marketed drugs across multiple therapeutic areas. He holds both an MBBS (UK equivalent of MD) and a PhD in Cardiac Physiology from the University of London.

Stephen Hill is Chief Operating Officer of Lyell Immunopharma, where he leads end‑to‑end development and manufacturing of cell therapy programs. He joined Lyell in 2019 to build its Technical Operations organization, establishing clinical manufacturing capabilities and advancing multiple programs into the clinic.

Mr. Hill brings deep expertise in biologics and cell therapy manufacturing, including large‑scale production, process scale‑up, global supply chain management, and operational excellence. Prior to Lyell, he was Head of Global Biologics Operations at AstraZeneca, overseeing manufacturing and supply across a global network of sites and commercial products.

Earlier in his career, Mr. Hill held multiple senior leadership roles at Amgen, where he led large‑scale biologics production, new product introductions, and global manufacturing initiatives.

Mr. Hill holds an MBA and a BS in microbiology, as well as a BA in political science, from the University of Washington.

Dr. Toni Hoover is Director, Strategy, Planning, and Management for Global Health, at the Bill and Melinda Gates Foundation. There, she leads a team that is responsible for supporting the programs and functions with business strategy and operations, portfolio and project management, and engagement with product development partners. Her team is working to create more opportunities to consistently deliver high impact interventions in global health by integrating the network of diverse partners involved in product development by leveraging their respective strengths. She also oversees the foundation’s Fellows program.

Before joining the foundation in 2012, Toni was senior vice president and site director at Pfizer Worldwide Research and Development, overseeing the operations of the company’s largest R&D laboratories located in Groton, Connecticut. She is a 25-year veteran of pharmaceutical R&D product development and management, having held positions in clinical research and operations, project and portfolio management, and laboratory and facilities management. While at Pfizer she led the global development of Lyrica® from exploratory development through early commercialization.

Toni received her Bachelor of Arts, Masters, and Doctorate in Psychology and Social Relations from Harvard University. She serves on several not-for-profit boards, including University of Washington Medicine, New York Academy of Sciences, Xavier University of Louisiana, the Joyce Theater, and the Pacific Northwest Ballet.

Terry Rosen has been leading successful drug discovery and development organizations in the biotechnology and pharmaceutical industries for over 30 years.

In 2015, he co-founded Arcus Biosciences, a drug discovery company focused on the treatment of cancer by blocking tumor-induced immunosuppression. Previously, he was co-founder and CEO of Flexus Biosciences, a company created to develop small-molecule drugs to reverse tumor immunosuppression, which was acquired by Bristol-Myers Squibb early in 2015 for $1.25 billion. Prior to Flexus, Terry served as Vice President, Therapeutic Discovery (TD) at Amgen and as the site head for Amgen South San Francisco, having joined Amgen with the acquisition of Tularik in 2004. He was named Amgen Washington site head in 2006, transitioned to a leadership role heading Chemistry Research and Discovery in 2007 and became the head of Protein Sciences in 2011. He and his leadership team were responsible for the creation of the TD organization, a group of 550+ staff responsible for all of Amgen’s large and small molecule drug discovery efforts.

Prior to joining Amgen, Terry held several executive positions at Tularik, including Executive Vice President, Operations, Vice President, Research Operations, and Vice President, Medicinal Chemistry. He has also held scientific and management positions at Pfizer and Abbott Laboratories. Terry serves on the Salk Institute Board of Trustees, the SAB and leadership committees of the University of Michigan Life Sciences Institute, the Board of Trustees of the UC Berkeley Foundation, the Caltech Biology & Bioengineering Chair’s Council, and the Board of the California Life Sciences Association.

Maggie Wilderotter is a seasoned executive who, as CEO, has led both Fortune 500 companies and start-ups in her career. In addition, she has extensive Board leadership serving on over 35 public company and 14 private company Boards of Directors.

Today, Mrs. Wilderotter serves on the public boards of Costco Wholesale Corporation, Hewlett Packard Enterprise, Cadence Design Systems, Lyft and is Board Chair at DocuSign. She serves on the private board of Tanium as well as a number of non-profit organizations. Mrs. Wilderotter is also a Senior Advisor to the Blackstone Group, Okta, and Atairos Private Equity.

Mrs. Wilderotter was Chief Executive Officer of Frontier Communications from November 2004 to April 2015, and then Executive Chairman of the company until April 2016. During her tenure with Frontier, the company grew from a regional telephone company with customer revenues of less than $1 billion to a national broadband, voice, and video provider with operations in 29 states and annualized revenues in excess of $10 billion.

Previously, Mrs. Wilderotter was Senior Vice President of Global Business Strategy and ran the Worldwide Public Sector at Microsoft. Before this, she was President and CEO of Wink Communications Inc., Executive Vice President of National Operations for AT&T Wireless Services Inc., Chief Executive Officer of AT&T’s Aviation Communications Division, and a Senior Vice President of McCaw Cellular Communications Inc.

Mrs. Wilderotter previously served on the President’s National Security Telecommunications Advisory Committee (NSTAC) as both Vice Chairman and Chairman during her 4-year tenure ending in 2014. Mrs. Wilderotter also served until January 2017 on the President’s special Commission responsible for a recommendation report to the new President of the United States on Enhancing National Cybersecurity.

Mrs. Wilderotter holds a bachelor’s degree in economics from the College of the Holy Cross. She has been awarded an Honorary Doctor of Engineering degree from the Stevens Institute of Technology and an Honorary Doctor of Laws degree from the University of Rochester.

Carlos Solórzano, PhD, is a Principal in the Biotech Private Equity team at Ally Bridge Group. Prior to Ally Bridge, Mr. Solórzano was in the investment teams at S32 and Pivotal bioVenture Partners where he participated or led over a dozen investments in biotech companies including Akouos (acquired by Eli Lilly), Avalyn, Evommune, Plexium, Arkuda, Obsidian and Nested Therapeutics.

Prior to his investment roles, Mr. Solórzano was an Associate Director in the corporate strategy and business development team at Ultragenyx Pharmaceutical where he worked on competitive intelligence, as well as portfolio, commercial and BD strategy. In particular, Carlos participated in Ultragenyx’ option to acquire GeneTx (ASO for Angelman Syndrome), the expansion of Ultragenyx’ collaboration agreement with Arcturus Therapeutics (nucleic acid therapeutics including mRNA), as well as in the technology and portfolio strategy of Ultragenyx’ gene therapy platform.

Prior to Ultragenyx, Mr. Solórzano worked as an equity research associate at Deutsche Bank and Oppenheimer & Co. covering smid- and large-cap biotech companies. He has a BS in chemical engineering from Cal Poly Pomona, earned a PhD in pharmacology from UC Irvine, and was an NIH postdoctoral scholar at UC San Francisco where he investigated the neurobiology of pain and itch.

Katina Dorton, JD, MBA, is a recognized and internationally experienced financial executive, corporate director, and public company CFO. Ms. Dorton’s strategic insights, expert perspective and financial acumen are informed by earlier career experience as a Wall Street investment banker and corporate transactions attorney. Her industry expertise includes healthcare and life sciences, industrial services, and financial services. She currently is CFO at NodThera, a private Boston-based company focused on the NLRP3 inflammasome.

Throughout her career, Ms. Dorton has advised executive leaders and boards of directors on capital markets, fund raising, mergers and acquisitions, and other strategic transactions, collectively valued at more than $50 billion. As CFO, she has built financial, legal, and operational functions to support companies through aggressive growth and transition including IPO preparation. She has served on several public company boards and has demonstrated strong leadership as Lead Director, Audit Chair and Governance Committee Chair. She meets the qualifications of an SEC financial expert, is a National Association of Corporate Directors (NACD) Corporate Governance Fellow, and serves on the NACD Lead Director Steering Committee. Ms. Dorton was named as one of Women Inc’s 2019 Most Influential Corporate Directors.

John Davis, MD, MPH, MS, is an experienced physician-scientist drug developer and biotechnology executive with deep expertise across multiple platforms, technologies, and therapeutic areas. He has a passion for developing novel therapeutics to improve the lives of patients and a track record of success in strategic leadership, global development, and regulatory strategy across multiple therapeutic areas in biotechnology, mid-size and large pharmaceutical, and academic settings for nearly 30 years.

Dr. Davis serves on the board of directors at SonomaBio and is Chair of the Science Committee. He previously served on the board of directors at Rheos Medicines and is a strategic advisor and member of the Scientific Advisory Board at HIBio Therapeutics and Oak Hill Bio. He is President of Norte Health Consulting. He is also an attending volunteer physician at the Boston VA Medical Center Rheumatology Clinic.

Previous roles include Head of Research and Development/Chief Medical Officer and Member of the Scientific Advisory Board at Magenta Therapeutics; Senior Vice President of Early Clinical Development at Pfizer; Global Head of Immunology and Vice President at Baxalta (Acquired by Shire), Therapeutic Area Head and Senior Group Director Inflammation, Cardiovascular/Metabolism gRED at Genentech, and Professor of Clinical Medicine and Director of Clinical Research Center, Lupus Clinic, and Spondylitis Clinic at UCSF.

Dr. Davis earned an MD from the University of Maryland, an MPH in Epidemiology from the UC Berkeley, and an M.S. in Anatomy from the University of Maryland. He trained in Internal Medicine and Rheumatology/Autoimmune Disease at UCSF and NIH. He is a Fellow in both the American College of Physicians and the American College of Rheumatology. He has authored over 120 publications and book chapters and has held international leadership positions in his areas of research focus in autoimmune disease.